35 kids is more than enough for any family.
The book contains everything mechanical that a kid of any century ought to know. Here is a diagram of how music is made in a piano. It is a complex coordinated activity of whippen flanges, cantilevers, dampeners and felted hammers. From it I learned that rubber bands could be stretched from one's front teeth and played pizzicato. However, the astute autodidact soon found higher notes wanted more stretching than rubber bands could manage.
We were customarily sent outside after breakfast and called in to supper several years later. As a result, most of our activities would necessarily fall in the category of outdoor pursuits. The book helped there too. It diagrammed the dynamics of kite ascension.
We learned, in the words of another kid (Benjamin Franklin), "a kite flies highest against the wind", and aimed tens of thousands of them eastward. String being unreliable in those days and kites being constructed of available materials --bamboo, newspaper and snot-- caused a century of the things to snap free and drift aloft to raise the elevation of the high Sierras.
This forced auto makers to add a lower gear to transmissions so people could safely traverse the grades and all us kids were ordered indoors to watch television, which by then was mostly bad horror films --you know, the ones with blood dripping from their titles-- then get up at like a million o'clock in the morning to go to church. There, we sat and debulliated --relieved only by the dream that we might grow up to own cool cars.